3100 for indy top 1/2 on sale,1000 for cnc work,1100 for good rockers t&d or jesel type,cause the ones that come with it,i wouldn't use for over 600hp or 6000 rpm.That comes to 5200 beans..o i almost forgot a basic port match to the intake which i agree is awesome maybe 5500$? or get a used set? just my